samba - Feb 2023 - [jra@samba.org: Re: Missing Files/Missing Folders from an NFS Share]

Forgot to CC: the list.
----- Forwarded message from Jeremy Allison <jra at samba.org> -----

Cc: jra at samba.org
Subject: Re: [Samba] Missing Files/Missing Folders from an NFS Share

On Wed, Feb 15, 2023 at 08:06:28PM +0100, Conor Armstrong
wrote:
>   Rowland & Jeremy - thanks for this!
>   I built a copy of the latest version from github 4.19 and same issue
>   arises. ?
>   I will have a look at the wireshark trace and see if I can spot anything
>   obvious there.
>   I'm not an expert on this, but as far?as I know NFS isn't fully
POSIX
>   compliant.? I'm not sure what is different/missing and whether that
is
>   causing the issue.? There must be some calls somewhere that are returning
>   different results from mounted local/block storage compared to a mounted
>   NFS share.
>   Running Samba on the server isn't an option for me as the share as it
is
>   Amazon EFS.
>   Strange that smbclient sees all the files but the windows?10 client
>   doesn't.? I would have thought they interact similarly?with smbd.
>   Anyway, I'll do a packet capture and see what that shows.
>   If anyone knows any other areas to focus on would be appreciated.
>   I know this issue has arisen a few times over the past couple of years
and
>   never any real resolution.? Would be good to get it solved once and for
>   all.
Samba is merely making opendir()/readdir()/closedir() calls in a
loop in this codepath. It's possible we may also be using seekdir()
telldir()/rewinddir() calls, which may not be returning a consistent
view of the directory over NFS.

Get debug level 10 logs plus a wireshark trace to see what is
going on both in the fileserver and on the wire.

----- End forwarded message -----

On 2/15/23 21:16, Jeremy Allison via samba wrote:
> Samba is merely making opendir()/readdir()/closedir() calls in a
> loop in this codepath. It's possible we may also be using seekdir()
> telldir()/rewinddir() calls, which may not be returning a consistent
> view of the directory over NFS.
this. We just recently analyzed the exact same issue for a customer. 
Turned out telldir()/seekdir() just isn't stable on NFS. The fix would 
be removing the use of telldir()/seekdir(), doable but non trivial.

-slow

-- 
Ralph Boehme, Samba Team                 https://samba.org/
SerNet Samba Team Lead      https://sernet.de/en/team-samba

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